{"schemaVersion":3,"id":"USN-3740-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities\n\nIt was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker in a guest virtual machine could use this to expose sensitive\ninformation (memory from other guests or the host OS). (CVE-2018-3646)\n\nIt was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker could use this to expose sensitive information (memory from the\nkernel or other processes). (CVE-2018-3620)\n\nJuha-Matti Tilli discovered that the IP implementation in the Linux kernel\nperformed algorithmically expensive operations in some situations when\nhandling incoming packet fragments. A remote attacker could use this to\ncause a denial of service. (CVE-2018-5391)","dates":{"published":"2018-08-14T21:47:54.000Z","modified":"2026-06-01T07:15:27.480Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"linux","name":"linux","label":"linux","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux","purlType":"deb","versions":[{"text":"< 4.15.0-32.35","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-32.35","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-aws","name":"linux-aws","label":"linux-aws","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-aws","purlType":"deb","versions":[{"text":"< 4.15.0-1019.19","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-1019.19","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-azure","name":"linux-azure","label":"linux-azure","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-azure","purlType":"deb","versions":[{"text":"< 4.15.0-1021.21","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-1021.21","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-gcp","name":"linux-gcp","label":"linux-gcp","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-gcp","purlType":"deb","versions":[{"text":"< 4.15.0-1017.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-1017.18","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-kvm","name":"linux-kvm","label":"linux-kvm","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-kvm","purlType":"deb","versions":[{"text":"< 4.15.0-1019.19","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-1019.19","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-oem","name":"linux-oem","label":"linux-oem","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-oem","purlType":"deb","versions":[{"text":"< 4.15.0-1015.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-1015.18","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-raspi2","name":"linux-raspi2","label":"linux-raspi2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-raspi2","purlType":"deb","versions":[{"text":"< 4.15.0-1020.22","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-1020.22","eol":null,"hubHref":null}],"affectedCount":7,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-3740-1","label":"ubuntu.com/security/notices/USN-3740-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-3620","label":"ubuntu.com/security/CVE-2018-3620","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2018-3646","label":"ubuntu.com/security/CVE-2018-3646","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2018-5391","label":"ubuntu.com/security/CVE-2018-5391","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2018-3620","CVE-2018-3646","CVE-2018-5391"],"downstream":[],"duplicates":[],"related":["CVE-2018-3620","CVE-2018-3646","CVE-2018-5391"]},"timeline":[{"kind":"published","date":"2018-08-14T21:47:54.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-01T07:15:27.480Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T05:00:04.586Z","stale":false,"partial":false}}